Tim Wunder <[EMAIL PROTECTED]> writes: > OK... So I : > "Filter specific rows, based on data from a "visible column", a column > storing > booleans indicating whether the row should be filtered or not, or based on > the return value of a "visible function", which gets a model, iter and > user_data and returns a boolean indicating whether the row should be filtered > or not." > Where do I do this filtering? I guess I'd need to create some sort of > "visible > function" that would make visible that which I want to filter???
Right ... well... you'll want to make that which you want to filter
*invisible*, but... ;)
When you create the GtkTreeModelFilter, you provide a function that fits the
signature of GtkTreeModelFilterVisibleFunc [1]. That is, make a new function
that has the same return value and arguments, and obeys the semantics
defined, then just use it's name to pass a pointer to the function for the
filtering algorithm to invoke later. Something like:
static gboolean
_gnc_sxslr_filter_func(GtkTreeModel *model, GtkTreeIter *iter, gpointer
data)
{
// filters out even rows
// (I made up the function name; this is all handwavy... --jsled)
gboolean is_even_row = gtk_tree_iter_get_row_number(model, iter) % 2 ==
0;
return !is_even_row;
}
// [...]
GtkTreeModel *filtered_model = gtk_tree_model_filter_new(existing_model,
NULL);
gtk_tree_model_filter_set_visible_func(filtered_model,
_gnc_sxslr_filter_func, NULL, NULL);
This is very similar to the use of an Interface in object-oriented languages
... the function pointer can be thought of as a functional interface.
> And WTF is
> an "iter"?
It represents a particular row in a particular model. The 4th paragraph of
[2] has a bit more color.
Generally, you'll want to read [3] to get a sense of how the TreeModel and
TreeView (and the rest of the related classes/types) interact. The design is
non-trival, but I don't really consider it overly complex, either.
[1]
http://library.gnome.org/devel/gtk/unstable/GtkTreeModelFilter.html#GtkTreeModelFilterVisibleFunc
[2] http://library.gnome.org/devel/gtk/unstable/GtkTreeModel.html#id3511622
[3] http://library.gnome.org/devel/gtk/unstable/TreeWidget.html
(All this is in your local devhelp, too.)
>> Color coding is always tricky ... in cultural significance ... in how it
[...]
> Yeah, I know. But it would look purdy if it had colors. ;)
Heh. :)
--
...jsled
http://asynchronous.org/ - a=jsled; b=asynchronous.org; echo [EMAIL PROTECTED]
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